Queensland farmers say a lack of information about a review of a possible inland rail route through the Darling Downs leaves them unable to plan for the future.

Deputy Prime Minister Michael McCormack has refused to provide a timeline for a review of a route through state-owned forestry.

The review was announced last month in response to concerns by farmers in the path of the chosen route of the $10 billion Melbourne-to-Brisbane rail line.

"This process is a priority for the Australian Government and will be considered as soon as possible when the required information has been compiled," Mr McCormack said.

"The Government will engage an independent consultant to review the information related to transit time, reliability, cost competitiveness, and availability to ensure the same methodology has been applied to these matters as was applied to the selected route."

Despite multiple requests, Mr MrCormack, Australian Rail Track Corporation, and the Federal Department of Infrastructure were unable to confirm the timeline.

The ABC understands the information is expected to be compiled by the end of the month.

Southbrook farmer Neil Owen, also the secretary of the Inner Downs Inland Rail Action Group, was calling for the review but said information had been "impossible" to obtain.

"We have been trying desperately to get hold of the route. We can't get that," he said.

"We can't get who is actually going to do the review.